def test_peers(self): m1 = MeiElement("music") musicid = m1.id b1 = MeiElement("body") s1 = MeiElement("staff") n1 = MeiElement("note") noteid = n1.id n2 = MeiElement("note") n3 = MeiElement("note") n4 = MeiElement("note") note4id = n4.id m1.addChild(b1) b1.addChild(s1) s1.addChild(n1) s1.addChild(n2) s1.addChild(n3) s1.addChild(n4) res = n2.getPeers() self.assertEqual(4, len(res)) self.assertEqual(noteid, res[0].id) self.assertEqual(note4id, res[3].id)